 |
전자부품 데이터시트 검색엔진 |
|
|
전자부품 데이터시트 검색엔진 |
|
HT82B42R 데이터시트(PDF) 13 Page - Holtek Semiconductor Inc |
|
|
|||||||||||||||||||||||||||||
HT82B42R 데이터시트(HTML) 13 Page - Holtek Semiconductor Inc |
|
|
13 / 86 page  Rev. 1.00 12 October 27, 2011 Rev. 1.00 13 October 27, 2011 HT82B42R/HT82B42RE I/O MCU with USB Interface System Architecture Akeyfactorinthehigh-performancefeaturesoftheHoltekrangeofmicrocontrollersisattributed totheinternalsystemarchitecture.Therangeofdevicestakeadvantageoftheusualfeaturesfound withinRISCmicrocontrollersprovidingincreasedspeedofoperationandenhancedperformance. Thepipeliningschemeisimplementedinsuchawaythatinstructionfetchingandinstruction executionareoverlapped,henceinstructionsareeffectivelyexecutedinonecycle,withthe exceptionofbranchorcallinstructions.An8-bitwideALUisusedinpracticallyalloperations oftheinstructionset.Itcarriesoutarithmeticoperations,logicoperations,rotation,increment, decrement,branchdecisions,etc..Theinternaldatapathissimplifiedbymovingdatathroughthe AccumulatorandtheALU.CertaininternalregistersareimplementedintheDataMemoryand canbedirectlyorindirectlyaddressed.Thesimpleaddressingmethodsoftheseregistersalong withadditionalarchitecturalfeaturesensurethataminimumofexternalcomponentsisrequiredto provideafunctionalI/OandA/Dcontrolsystemwithmaximumreliabilityandflexibility. Clocking and Pipelining Thesystemclockisderivedfromaninternaloscillatorandissubdividedintofourinternally generatednon-overlappingclocks,T1~T4.TheProgramCounterisincrementedatthebeginning oftheT1clockduringwhichtimeanewinstructionisfetched.TheremainingT2~T4clockscarry outthedecodingandexecutionfunctions.Inthisway,oneT1~T4clockcycleformsoneinstruction cycle.Althoughthefetchingandexecutionofinstructionstakesplaceinconsecutiveinstruction cycles,thepipeliningstructureofthemicrocontrollerensuresthatinstructionsareeffectively executedinoneinstructioncycle.Theexceptiontothisareinstructionswherethecontentsofthe ProgramCounterarechanged,suchassubroutinecallsorjumps,inwhichcasetheinstructionwill takeonemoreinstructioncycletoexecute. Forinstructionsinvolvingbranches,suchasjumporcallinstructions,twomachinecyclesare requiredtocompleteinstructionexecution.Anextracycleisrequiredastheprogramtakesone cycletofirstobtaintheactualjumporcalladdressandthenanothercycletoactuallyexecutethe branch.Therequirementforthisextracycleshouldbetakenintoaccountbyprogrammersintiming sensitiveapplications. Program Counter Duringprogramexecution,theProgramCounterisusedtokeeptrackoftheaddressofthenext instructiontobeexecuted.Itisautomaticallyincrementedbyoneeachtimeaninstructionis executedexceptforinstructions,suchas"JMP"or"CALL"thatdemandajumptoanon-consecutive ProgramMemoryaddress.Itmustbenotedthatonlythelower8bits,knownastheProgram CounterLowRegister,aredirectlyaddressablebyuser. |
|
링크 URL |
| ALLDATASHEET 가 귀하에 도움이 되셨나요? [ DONATE ] |
Alldatasheet는? | 광고문의 | 운영자에게 연락하기 | 개인정보취급방침 | 링크 투 데이터시트 | 링크교환 | 제조사별 검색 All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Korean ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
